Ed Sobey 
Field Guide to Rodside Technology [PDF ebook] 

This fascinating handbook answers the questions of anyone who has ever wondered about the many strange devices found along the roadside, from utility poles to satellite dishes. Devices are grouped according to their habitats-along highways and roads, atop buildings, near airports, and on utility towers. More than 150 different roadside technologies are covered, and each detailed entry describes what the device does, how it works, and also includes a photograph for easy identification. With helpful sidebars describing related technical issues such as why stoplights are constructed with the red light on top, this handbook for curious readers provides carefully detailed descriptions and the history behind many of the devices that roadside travelers take for granted.